If your board doesn't come with CircuitPython running on it already then check out your board's guide for how to load CircuitPython firmware. For example the Feather M0 express guide is a good reference.
If you're using a FeatherWing and Feather just slide the wing onto the Feather board and you're all set! The FeatherWing will automatically be connected to the board using its I2C connection. Skip to the next page to learn about the software to control the display.
If you're using a Charlieplex breakout you'll need to connect its power, ground, and I2C connections to the board. For example the wiring for a Charlieplex driver to Feather HUZZAH ESP8266 might look like:
- Board SCL / I2C clock to Charlieplex Driver SCL.
- Board SDA / I2C data to Charlieplex Driver SDA.
- Board 3.3V power to Charlieplex Driver VCC.
- Board GND / ground to Charlieplex Driver GND.